[weld-dev] Interceptors

[Emily Jiang]

Thank you Jozef for the helpful info. I have another question on
interceptor:
EE7 spec states the JavaEE component classes, listed in Table EE.5-1, need
to support interceptors. Take servlet for an example, which methods can be
intercepted?

As the servlet classes are invoked by the container, according to CDI1.2
spec, it seems only service(ServletRequest, ServletResponse) can be
intercepted. No other methods can be intercepted.

Normally customer applications override doPost or doGet, but they cannot be
intercepted. I cannot see any value of support interceptors on Servlet.
Anything I missed?

On Tue, May 12, 2015 at 7:50 AM, Jozef Hartinger <jharting at redhat.com>
wrote:

>  On 05/11/2015 03:47 PM, Emily Jiang wrote:
>
>
>  I have a few questions on interceptors:
>
>  1. CDI Interceptors on cdi beans
>  Will the interceptors share the same creational context as the bean it is
> associated with?
>
> Yes. It is not the very same creational context but a new one with a
> parent-child relationship to the one of the associated bean. This is the
> same as for @Dependent dependencies
>
>    Will Weld managed the cdi interceptors as well as the old-styled
> interceptors?
>
> Yes, Weld manages interceptor bindings associated using interceptor
> bindings as well as those associated using @Interceptors
>
>    @Interceptors don't work on other cdi beans except ejb and managed
> beans, right?
>
> "Managed bean" is ambiguous. Weld support interceptors on all CDI managed
> beans (not on producer fields/methods nor extension-provided beans).
>
>
>  2. Interceptors on ejb beans or managed beans
>  I think the integrator needs to create these @Interceptors and cdi
> interceptors.
>
> Yes, for EJBs and EE managed beans it is integrator's job to handle those.
> Weld can handle @AroundConstruct interceptors if needed. I've updated the
> docs on this topic recently:
> https://github.com/jharting/core/blob/a1eb6194be36ded86dc9709c6767f5016fb98997/docs/reference/src/main/asciidoc/ri-spi.asciidoc#around-construct-interception
>
>   Will these interceptors use the non-contextual creational context
> (scope @Dependent) or use the ejb or managed bean's creational context?
>
> ejb or managed bean's creational context
>
>
> Will Weld destroy the interceptors when the associated beans are destroyed
> or the integrator need to destroy them? This logic applicable to both cdi
> interceptors and @Interceptors style interceptors, right?
>
> Any time the parent (bean's) creational context is destroyed, the children
> creational contexts (interceptors') are destroyed also by Weld.
>
>
>  3. Interceptors on JavaEE components
>  I think this interceptors are created by Weld when the JavaEE component
> classes are created, right? By the way, how can the container make sure to
> destroy the interceptors?
>
> This depends on how the component classes are managed. Assuming the
> components are managed using Weld-provided InjectionTarget then it is up to
> the integrator to decide whether it provides interception support or
> whether it should be provided by Weld. This can be configured for each
> InjectionTarget individually using this builder:
> http://docs.jboss.org/weld/javadoc/2.2/weld-spi/org/jboss/weld/manager/api/WeldInjectionTargetBuilder.html
>
>
>
>      --
> Thanks
> Emily
> =================
> Emily Jiang
> ejiang at apache.org
>
>
> _______________________________________________
> weld-dev mailing listweld-dev at lists.jboss.orghttps://lists.jboss.org/mailman/listinfo/weld-dev
>
>
>


-- 
Thanks
Emily
=================
Emily Jiang
ejiang at apache.org
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